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<?php $output = array(); foreach($your_array as $key => $current) { if( !array_key_exists($current, $output) ) { // create new entry $output[$current] = array( $key ); } else { // add to existing entry $output[$current][] = $key; } } print_r($output); ?>
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $your_array in /in/LgTcK on line 4 Warning: foreach() argument must be of type array|object, null given in /in/LgTcK on line 4 Array ( )

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